mineral

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Hardness: 5.5-6.0 Mohs; Color: Royal blue to grey with white calcite streaks; Luster: Vitreous to greasy; Crystal Structure: Isometric; Density: 2.27-2.33 g/cm3; Cleavage: Poor/indistinct.

Hardness: 5
Color: Royal blue to grey with white calcite streaks
Luster: Vitreous to greasy

Identified May 19, 2026More mineral →

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Physical properties

Hardness: 5.5-6.0 Mohs; Color: Royal blue to grey with white calcite streaks; Luster: Vitreous to greasy; Crystal Structure: Isometric; Density: 2.27-2.33 g/cm3; Cleavage: Poor/indistinct.

Formation & geological history

Formed primarily in alkaline igneous rocks like nepheline syenites and phonolites through magmatic crystallization. It is a member of the feldspathoid group.

Uses & applications

Used predominantly as a gemstone for jewelry, decorative carvings, beads, and sometimes as an architectural surface material (countertops/slabs).

Geological facts

Sodalite is often confused with Lapis Lazuli, but it lacks the gold-colored pyrite specks characteristic of Lapis. It was discovered in Greenland in 1811 but became popular after large deposits were found in Ontario during a royal visit in 1901.

Field identification & locations

Identify by its deep blue color and characteristic white calcite veins. Unlike Lapis, it is rarely found with pyrite. It occurs in silica-poor igneous environments. Notable locations include Canada, Brazil, Namibia, and Russia.